* [PATCH v4 1/7] clk: bcm281xx: warn if ccu_wait_bit() fails
2014-04-08 21:43 [PATCH v4 0/7] clk: bcm281xx: updates Alex Elder
@ 2014-04-08 21:43 ` Alex Elder
2014-04-08 21:43 ` [PATCH v4 2/7] clk: bcm281xx: use init_data.name for clock name Alex Elder
` (5 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: Alex Elder @ 2014-04-08 21:43 UTC (permalink / raw)
To: linux-arm-kernel
Don't let a failure of ccu_wait_bit() go unnoticed.
Signed-off-by: Alex Elder <elder@linaro.org>
---
drivers/clk/bcm/clk-kona.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/clk/bcm/clk-kona.c b/drivers/clk/bcm/clk-kona.c
index db11a87..4b4e35a 100644
--- a/drivers/clk/bcm/clk-kona.c
+++ b/drivers/clk/bcm/clk-kona.c
@@ -207,6 +207,9 @@ __ccu_wait_bit(struct ccu_data *ccu, u32 reg_offset, u32 bit, bool want)
return true;
udelay(1);
}
+ pr_warn("%s: %s/0x%04x bit %u was never %s\n", __func__,
+ ccu->name, reg_offset, bit, want ? "set" : "clear");
+
return false;
}
--
1.7.9.5
^ permalink raw reply related [flat|nested] 8+ messages in thread* [PATCH v4 2/7] clk: bcm281xx: use init_data.name for clock name
2014-04-08 21:43 [PATCH v4 0/7] clk: bcm281xx: updates Alex Elder
2014-04-08 21:43 ` [PATCH v4 1/7] clk: bcm281xx: warn if ccu_wait_bit() fails Alex Elder
@ 2014-04-08 21:43 ` Alex Elder
2014-04-08 21:43 ` [PATCH v4 3/7] clk: bcm281xx: change some symbol names Alex Elder
` (4 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: Alex Elder @ 2014-04-08 21:43 UTC (permalink / raw)
To: linux-arm-kernel
Use the init_data.name field to hold the name of a Kona clock rather
than duplicating it.
Signed-off-by: Alex Elder <elder@linaro.org>
---
drivers/clk/bcm/clk-kona-setup.c | 6 +++---
drivers/clk/bcm/clk-kona.c | 17 ++++++++++-------
drivers/clk/bcm/clk-kona.h | 3 +--
3 files changed, 14 insertions(+), 12 deletions(-)
diff --git a/drivers/clk/bcm/clk-kona-setup.c b/drivers/clk/bcm/clk-kona-setup.c
index 54a0652..9e7a9c1 100644
--- a/drivers/clk/bcm/clk-kona-setup.c
+++ b/drivers/clk/bcm/clk-kona-setup.c
@@ -64,7 +64,7 @@ static bool peri_clk_data_offsets_valid(struct kona_clk *bcm_clk)
BUG_ON(bcm_clk->type != bcm_clk_peri);
peri = bcm_clk->u.peri;
- name = bcm_clk->name;
+ name = bcm_clk->init_data.name;
range = bcm_clk->ccu->range;
limit = range - sizeof(u32);
@@ -330,7 +330,7 @@ peri_clk_data_valid(struct kona_clk *bcm_clk)
return false;
peri = bcm_clk->u.peri;
- name = bcm_clk->name;
+ name = bcm_clk->init_data.name;
gate = &peri->gate;
if (gate_exists(gate) && !gate_valid(gate, "gate", name))
return false;
@@ -631,7 +631,7 @@ struct clk *kona_clk_setup(struct ccu_data *ccu, const char *name,
return NULL;
}
bcm_clk->ccu = ccu;
- bcm_clk->name = name;
+ bcm_clk->init_data.name = name;
init_data = &bcm_clk->init_data;
init_data->name = name;
diff --git a/drivers/clk/bcm/clk-kona.c b/drivers/clk/bcm/clk-kona.c
index 4b4e35a..bf0b70e 100644
--- a/drivers/clk/bcm/clk-kona.c
+++ b/drivers/clk/bcm/clk-kona.c
@@ -809,7 +809,7 @@ static int kona_peri_clk_enable(struct clk_hw *hw)
struct kona_clk *bcm_clk = to_kona_clk(hw);
struct bcm_clk_gate *gate = &bcm_clk->u.peri->gate;
- return clk_gate(bcm_clk->ccu, bcm_clk->name, gate, true);
+ return clk_gate(bcm_clk->ccu, bcm_clk->init_data.name, gate, true);
}
static void kona_peri_clk_disable(struct clk_hw *hw)
@@ -817,7 +817,7 @@ static void kona_peri_clk_disable(struct clk_hw *hw)
struct kona_clk *bcm_clk = to_kona_clk(hw);
struct bcm_clk_gate *gate = &bcm_clk->u.peri->gate;
- (void)clk_gate(bcm_clk->ccu, bcm_clk->name, gate, false);
+ (void)clk_gate(bcm_clk->ccu, bcm_clk->init_data.name, gate, false);
}
static int kona_peri_clk_is_enabled(struct clk_hw *hw)
@@ -875,12 +875,13 @@ static int kona_peri_clk_set_parent(struct clk_hw *hw, u8 index)
ret = selector_write(bcm_clk->ccu, &data->gate, sel, trig, index);
if (ret == -ENXIO) {
- pr_err("%s: gating failure for %s\n", __func__, bcm_clk->name);
+ pr_err("%s: gating failure for %s\n", __func__,
+ bcm_clk->init_data.name);
ret = -EIO; /* Don't proliferate weird errors */
} else if (ret == -EIO) {
pr_err("%s: %strigger failed for %s\n", __func__,
trig == &data->pre_trig ? "pre-" : "",
- bcm_clk->name);
+ bcm_clk->init_data.name);
}
return ret;
@@ -939,10 +940,12 @@ static int kona_peri_clk_set_rate(struct clk_hw *hw, unsigned long rate,
ret = divider_write(bcm_clk->ccu, &data->gate, &data->div,
&data->trig, scaled_div);
if (ret == -ENXIO) {
- pr_err("%s: gating failure for %s\n", __func__, bcm_clk->name);
+ pr_err("%s: gating failure for %s\n", __func__,
+ bcm_clk->init_data.name);
ret = -EIO; /* Don't proliferate weird errors */
} else if (ret == -EIO) {
- pr_err("%s: trigger failed for %s\n", __func__, bcm_clk->name);
+ pr_err("%s: trigger failed for %s\n", __func__,
+ bcm_clk->init_data.name);
}
return ret;
@@ -964,7 +967,7 @@ static bool __peri_clk_init(struct kona_clk *bcm_clk)
{
struct ccu_data *ccu = bcm_clk->ccu;
struct peri_clk_data *peri = bcm_clk->u.peri;
- const char *name = bcm_clk->name;
+ const char *name = bcm_clk->init_data.name;
struct bcm_clk_trig *trig;
BUG_ON(bcm_clk->type != bcm_clk_peri);
diff --git a/drivers/clk/bcm/clk-kona.h b/drivers/clk/bcm/clk-kona.h
index dee6909..1a7eba4 100644
--- a/drivers/clk/bcm/clk-kona.h
+++ b/drivers/clk/bcm/clk-kona.h
@@ -373,8 +373,7 @@ struct peri_clk_data {
struct kona_clk {
struct clk_hw hw;
- struct clk_init_data init_data;
- const char *name; /* name of this clock */
+ struct clk_init_data init_data; /* includes name of this clock */
struct ccu_data *ccu; /* ccu this clock is associated with */
enum bcm_clk_type type;
union {
--
1.7.9.5
^ permalink raw reply related [flat|nested] 8+ messages in thread* [PATCH v4 3/7] clk: bcm281xx: change some symbol names
2014-04-08 21:43 [PATCH v4 0/7] clk: bcm281xx: updates Alex Elder
2014-04-08 21:43 ` [PATCH v4 1/7] clk: bcm281xx: warn if ccu_wait_bit() fails Alex Elder
2014-04-08 21:43 ` [PATCH v4 2/7] clk: bcm281xx: use init_data.name for clock name Alex Elder
@ 2014-04-08 21:43 ` Alex Elder
2014-04-08 21:43 ` [PATCH v4 4/7] clk: bcm281xx: initialize CCU structures statically Alex Elder
` (3 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: Alex Elder @ 2014-04-08 21:43 UTC (permalink / raw)
To: linux-arm-kernel
As I developed the bcm281xx clock code I understood there were
restrictions on device tree "compatible" strings names, and as a
result "bcm11351" was used in places despite the part family being
more properly called "bcm281xx". This can be a little confusing.
In some cases I went to far and things using "bcm11351" when that
was not necessary.
This patch remedies this. It renames the symbol used to define the
"compatible" string (but not its value) so it uses "BCM281XX".
Similarly, the name names provided to the CLK_OF_DECLARE() macro
are changed, hoping to minimize the number of places that the
confusing "11351" string is used.
Signed-off-by: Alex Elder <elder@linaro.org>
---
drivers/clk/bcm/clk-bcm281xx.c | 27 ++++++++++++++++-----------
1 file changed, 16 insertions(+), 11 deletions(-)
diff --git a/drivers/clk/bcm/clk-bcm281xx.c b/drivers/clk/bcm/clk-bcm281xx.c
index 3c66de6..bb947af 100644
--- a/drivers/clk/bcm/clk-bcm281xx.c
+++ b/drivers/clk/bcm/clk-bcm281xx.c
@@ -15,12 +15,17 @@
#include "clk-kona.h"
#include "dt-bindings/clock/bcm281xx.h"
-/* bcm11351 CCU device tree "compatible" strings */
-#define BCM11351_DT_ROOT_CCU_COMPAT "brcm,bcm11351-root-ccu"
-#define BCM11351_DT_AON_CCU_COMPAT "brcm,bcm11351-aon-ccu"
-#define BCM11351_DT_HUB_CCU_COMPAT "brcm,bcm11351-hub-ccu"
-#define BCM11351_DT_MASTER_CCU_COMPAT "brcm,bcm11351-master-ccu"
-#define BCM11351_DT_SLAVE_CCU_COMPAT "brcm,bcm11351-slave-ccu"
+/*
+ * These are the bcm281xx CCU device tree "compatible" strings.
+ * We're stuck with using "bcm11351" in the string because wild
+ * cards aren't allowed, and that name was the first one defined
+ * in this family of devices.
+ */
+#define BCM281XX_DT_ROOT_CCU_COMPAT "brcm,bcm11351-root-ccu"
+#define BCM281XX_DT_AON_CCU_COMPAT "brcm,bcm11351-aon-ccu"
+#define BCM281XX_DT_HUB_CCU_COMPAT "brcm,bcm11351-hub-ccu"
+#define BCM281XX_DT_MASTER_CCU_COMPAT "brcm,bcm11351-master-ccu"
+#define BCM281XX_DT_SLAVE_CCU_COMPAT "brcm,bcm11351-slave-ccu"
/* Root CCU clocks */
@@ -404,13 +409,13 @@ static void __init kona_dt_slave_ccu_setup(struct device_node *node)
kona_dt_ccu_setup(node, bcm281xx_slave_ccu_clks_setup);
}
-CLK_OF_DECLARE(bcm11351_root_ccu, BCM11351_DT_ROOT_CCU_COMPAT,
+CLK_OF_DECLARE(bcm281xx_root_ccu, BCM281XX_DT_ROOT_CCU_COMPAT,
kona_dt_root_ccu_setup);
-CLK_OF_DECLARE(bcm11351_aon_ccu, BCM11351_DT_AON_CCU_COMPAT,
+CLK_OF_DECLARE(bcm281xx_aon_ccu, BCM281XX_DT_AON_CCU_COMPAT,
kona_dt_aon_ccu_setup);
-CLK_OF_DECLARE(bcm11351_hub_ccu, BCM11351_DT_HUB_CCU_COMPAT,
+CLK_OF_DECLARE(bcm281xx_hub_ccu, BCM281XX_DT_HUB_CCU_COMPAT,
kona_dt_hub_ccu_setup);
-CLK_OF_DECLARE(bcm11351_master_ccu, BCM11351_DT_MASTER_CCU_COMPAT,
+CLK_OF_DECLARE(bcm281xx_master_ccu, BCM281XX_DT_MASTER_CCU_COMPAT,
kona_dt_master_ccu_setup);
-CLK_OF_DECLARE(bcm11351_slave_ccu, BCM11351_DT_SLAVE_CCU_COMPAT,
+CLK_OF_DECLARE(bcm281xx_slave_ccu, BCM281XX_DT_SLAVE_CCU_COMPAT,
kona_dt_slave_ccu_setup);
--
1.7.9.5
^ permalink raw reply related [flat|nested] 8+ messages in thread* [PATCH v4 4/7] clk: bcm281xx: initialize CCU structures statically
2014-04-08 21:43 [PATCH v4 0/7] clk: bcm281xx: updates Alex Elder
` (2 preceding siblings ...)
2014-04-08 21:43 ` [PATCH v4 3/7] clk: bcm281xx: change some symbol names Alex Elder
@ 2014-04-08 21:43 ` Alex Elder
2014-04-08 21:43 ` [PATCH v4 5/7] clk: bcm281xx: define CCU clock data statically Alex Elder
` (2 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: Alex Elder @ 2014-04-08 21:43 UTC (permalink / raw)
To: linux-arm-kernel
We know up front how many CCU's we'll support, so there's no need to
allocate their data structures dynamically. Define a macro
KONA_CCU_COMMON() to simplify the initialization of many of the
fields in a ccu_data structure. Pass the address of a statically
defined CCU structure to kona_dt_ccu_setup() rather than having that
function allocate one.
We also know at build time how many clocks a given CCU will provide,
though the number of of them for each CCU is different. Record the
number of clocks we need in the CCU's clk_onecell_data struct
(which is used when we register the CCU with the common clock code
as a clock provider). Rename that struct field "clk_data" (because
"data" alone gets a little confusing).
Use the known clock count to move the allocation of each CCU's
clocks array into ccu_clks_setup() rather than having each CCU's
setup callback function do it.
(The real motivation behind all of this is that we'll be doing some
static initialization of some additional CCU-specific data soon.)
Signed-off-by: Alex Elder <elder@linaro.org>
---
drivers/clk/bcm/clk-bcm281xx.c | 144 +++++++++++++++-----------------------
drivers/clk/bcm/clk-kona-setup.c | 47 ++++++-------
drivers/clk/bcm/clk-kona.c | 4 +-
drivers/clk/bcm/clk-kona.h | 21 ++++--
4 files changed, 97 insertions(+), 119 deletions(-)
diff --git a/drivers/clk/bcm/clk-bcm281xx.c b/drivers/clk/bcm/clk-bcm281xx.c
index bb947af..d72f2ae 100644
--- a/drivers/clk/bcm/clk-bcm281xx.c
+++ b/drivers/clk/bcm/clk-bcm281xx.c
@@ -15,6 +15,9 @@
#include "clk-kona.h"
#include "dt-bindings/clock/bcm281xx.h"
+#define BCM281XX_CCU_COMMON(_name, _ucase_name) \
+ KONA_CCU_COMMON(BCM281XX, _name, _ucase_name)
+
/*
* These are the bcm281xx CCU device tree "compatible" strings.
* We're stuck with using "bcm11351" in the string because wild
@@ -27,7 +30,7 @@
#define BCM281XX_DT_MASTER_CCU_COMPAT "brcm,bcm11351-master-ccu"
#define BCM281XX_DT_SLAVE_CCU_COMPAT "brcm,bcm11351-slave-ccu"
-/* Root CCU clocks */
+/* Root CCU */
static struct peri_clk_data frac_1m_data = {
.gate = HW_SW_GATE(0x214, 16, 0, 1),
@@ -36,7 +39,11 @@ static struct peri_clk_data frac_1m_data = {
.clocks = CLOCKS("ref_crystal"),
};
-/* AON CCU clocks */
+static struct ccu_data root_ccu_data = {
+ BCM281XX_CCU_COMMON(root, ROOT),
+};
+
+/* AON CCU */
static struct peri_clk_data hub_timer_data = {
.gate = HW_SW_GATE(0x0414, 16, 0, 1),
@@ -65,7 +72,11 @@ static struct peri_clk_data pmu_bsc_var_data = {
.trig = TRIGGER(0x0a40, 2),
};
-/* Hub CCU clocks */
+static struct ccu_data aon_ccu_data = {
+ BCM281XX_CCU_COMMON(aon, AON),
+};
+
+/* Hub CCU */
static struct peri_clk_data tmon_1m_data = {
.gate = HW_SW_GATE(0x04a4, 18, 2, 3),
@@ -75,7 +86,11 @@ static struct peri_clk_data tmon_1m_data = {
.trig = TRIGGER(0x0e84, 1),
};
-/* Master CCU clocks */
+static struct ccu_data hub_ccu_data = {
+ BCM281XX_CCU_COMMON(hub, HUB),
+};
+
+/* Master CCU */
static struct peri_clk_data sdio1_data = {
.gate = HW_SW_GATE(0x0358, 18, 2, 3),
@@ -158,7 +173,11 @@ static struct peri_clk_data hsic2_12m_data = {
.trig = TRIGGER(0x0afc, 5),
};
-/* Slave CCU clocks */
+static struct ccu_data master_ccu_data = {
+ BCM281XX_CCU_COMMON(master, MASTER),
+};
+
+/* Slave CCU */
static struct peri_clk_data uartb_data = {
.gate = HW_SW_GATE(0x0400, 18, 2, 3),
@@ -266,6 +285,10 @@ static struct peri_clk_data pwm_data = {
.trig = TRIGGER(0x0afc, 15),
};
+static struct ccu_data slave_ccu_data = {
+ BCM281XX_CCU_COMMON(slave, SLAVE),
+};
+
/*
* CCU setup routines
*
@@ -277,107 +300,52 @@ static struct peri_clk_data pwm_data = {
*/
static int __init bcm281xx_root_ccu_clks_setup(struct ccu_data *ccu)
{
- struct clk **clks;
- size_t count = BCM281XX_ROOT_CCU_CLOCK_COUNT;
-
- clks = kzalloc(count * sizeof(*clks), GFP_KERNEL);
- if (!clks) {
- pr_err("%s: failed to allocate root clocks\n", __func__);
- return -ENOMEM;
- }
- ccu->data.clks = clks;
- ccu->data.clk_num = count;
-
- PERI_CLK_SETUP(clks, ccu, BCM281XX_ROOT_CCU_FRAC_1M, frac_1m);
+ PERI_CLK_SETUP(ccu, BCM281XX_ROOT_CCU_FRAC_1M, frac_1m);
return 0;
}
static int __init bcm281xx_aon_ccu_clks_setup(struct ccu_data *ccu)
{
- struct clk **clks;
- size_t count = BCM281XX_AON_CCU_CLOCK_COUNT;
-
- clks = kzalloc(count * sizeof(*clks), GFP_KERNEL);
- if (!clks) {
- pr_err("%s: failed to allocate aon clocks\n", __func__);
- return -ENOMEM;
- }
- ccu->data.clks = clks;
- ccu->data.clk_num = count;
-
- PERI_CLK_SETUP(clks, ccu, BCM281XX_AON_CCU_HUB_TIMER, hub_timer);
- PERI_CLK_SETUP(clks, ccu, BCM281XX_AON_CCU_PMU_BSC, pmu_bsc);
- PERI_CLK_SETUP(clks, ccu, BCM281XX_AON_CCU_PMU_BSC_VAR, pmu_bsc_var);
+ PERI_CLK_SETUP(ccu, BCM281XX_AON_CCU_HUB_TIMER, hub_timer);
+ PERI_CLK_SETUP(ccu, BCM281XX_AON_CCU_PMU_BSC, pmu_bsc);
+ PERI_CLK_SETUP(ccu, BCM281XX_AON_CCU_PMU_BSC_VAR, pmu_bsc_var);
return 0;
}
static int __init bcm281xx_hub_ccu_clks_setup(struct ccu_data *ccu)
{
- struct clk **clks;
- size_t count = BCM281XX_HUB_CCU_CLOCK_COUNT;
-
- clks = kzalloc(count * sizeof(*clks), GFP_KERNEL);
- if (!clks) {
- pr_err("%s: failed to allocate hub clocks\n", __func__);
- return -ENOMEM;
- }
- ccu->data.clks = clks;
- ccu->data.clk_num = count;
-
- PERI_CLK_SETUP(clks, ccu, BCM281XX_HUB_CCU_TMON_1M, tmon_1m);
+ PERI_CLK_SETUP(ccu, BCM281XX_HUB_CCU_TMON_1M, tmon_1m);
return 0;
}
static int __init bcm281xx_master_ccu_clks_setup(struct ccu_data *ccu)
{
- struct clk **clks;
- size_t count = BCM281XX_MASTER_CCU_CLOCK_COUNT;
-
- clks = kzalloc(count * sizeof(*clks), GFP_KERNEL);
- if (!clks) {
- pr_err("%s: failed to allocate master clocks\n", __func__);
- return -ENOMEM;
- }
- ccu->data.clks = clks;
- ccu->data.clk_num = count;
-
- PERI_CLK_SETUP(clks, ccu, BCM281XX_MASTER_CCU_SDIO1, sdio1);
- PERI_CLK_SETUP(clks, ccu, BCM281XX_MASTER_CCU_SDIO2, sdio2);
- PERI_CLK_SETUP(clks, ccu, BCM281XX_MASTER_CCU_SDIO3, sdio3);
- PERI_CLK_SETUP(clks, ccu, BCM281XX_MASTER_CCU_SDIO4, sdio4);
- PERI_CLK_SETUP(clks, ccu, BCM281XX_MASTER_CCU_USB_IC, usb_ic);
- PERI_CLK_SETUP(clks, ccu, BCM281XX_MASTER_CCU_HSIC2_48M, hsic2_48m);
- PERI_CLK_SETUP(clks, ccu, BCM281XX_MASTER_CCU_HSIC2_12M, hsic2_12m);
+ PERI_CLK_SETUP(ccu, BCM281XX_MASTER_CCU_SDIO1, sdio1);
+ PERI_CLK_SETUP(ccu, BCM281XX_MASTER_CCU_SDIO2, sdio2);
+ PERI_CLK_SETUP(ccu, BCM281XX_MASTER_CCU_SDIO3, sdio3);
+ PERI_CLK_SETUP(ccu, BCM281XX_MASTER_CCU_SDIO4, sdio4);
+ PERI_CLK_SETUP(ccu, BCM281XX_MASTER_CCU_USB_IC, usb_ic);
+ PERI_CLK_SETUP(ccu, BCM281XX_MASTER_CCU_HSIC2_48M, hsic2_48m);
+ PERI_CLK_SETUP(ccu, BCM281XX_MASTER_CCU_HSIC2_12M, hsic2_12m);
return 0;
}
static int __init bcm281xx_slave_ccu_clks_setup(struct ccu_data *ccu)
{
- struct clk **clks;
- size_t count = BCM281XX_SLAVE_CCU_CLOCK_COUNT;
-
- clks = kzalloc(count * sizeof(*clks), GFP_KERNEL);
- if (!clks) {
- pr_err("%s: failed to allocate slave clocks\n", __func__);
- return -ENOMEM;
- }
- ccu->data.clks = clks;
- ccu->data.clk_num = count;
-
- PERI_CLK_SETUP(clks, ccu, BCM281XX_SLAVE_CCU_UARTB, uartb);
- PERI_CLK_SETUP(clks, ccu, BCM281XX_SLAVE_CCU_UARTB2, uartb2);
- PERI_CLK_SETUP(clks, ccu, BCM281XX_SLAVE_CCU_UARTB3, uartb3);
- PERI_CLK_SETUP(clks, ccu, BCM281XX_SLAVE_CCU_UARTB4, uartb4);
- PERI_CLK_SETUP(clks, ccu, BCM281XX_SLAVE_CCU_SSP0, ssp0);
- PERI_CLK_SETUP(clks, ccu, BCM281XX_SLAVE_CCU_SSP2, ssp2);
- PERI_CLK_SETUP(clks, ccu, BCM281XX_SLAVE_CCU_BSC1, bsc1);
- PERI_CLK_SETUP(clks, ccu, BCM281XX_SLAVE_CCU_BSC2, bsc2);
- PERI_CLK_SETUP(clks, ccu, BCM281XX_SLAVE_CCU_BSC3, bsc3);
- PERI_CLK_SETUP(clks, ccu, BCM281XX_SLAVE_CCU_PWM, pwm);
+ PERI_CLK_SETUP(ccu, BCM281XX_SLAVE_CCU_UARTB, uartb);
+ PERI_CLK_SETUP(ccu, BCM281XX_SLAVE_CCU_UARTB2, uartb2);
+ PERI_CLK_SETUP(ccu, BCM281XX_SLAVE_CCU_UARTB3, uartb3);
+ PERI_CLK_SETUP(ccu, BCM281XX_SLAVE_CCU_UARTB4, uartb4);
+ PERI_CLK_SETUP(ccu, BCM281XX_SLAVE_CCU_SSP0, ssp0);
+ PERI_CLK_SETUP(ccu, BCM281XX_SLAVE_CCU_SSP2, ssp2);
+ PERI_CLK_SETUP(ccu, BCM281XX_SLAVE_CCU_BSC1, bsc1);
+ PERI_CLK_SETUP(ccu, BCM281XX_SLAVE_CCU_BSC2, bsc2);
+ PERI_CLK_SETUP(ccu, BCM281XX_SLAVE_CCU_BSC3, bsc3);
+ PERI_CLK_SETUP(ccu, BCM281XX_SLAVE_CCU_PWM, pwm);
return 0;
}
@@ -386,27 +354,29 @@ static int __init bcm281xx_slave_ccu_clks_setup(struct ccu_data *ccu)
static void __init kona_dt_root_ccu_setup(struct device_node *node)
{
- kona_dt_ccu_setup(node, bcm281xx_root_ccu_clks_setup);
+ kona_dt_ccu_setup(&root_ccu_data, node, bcm281xx_root_ccu_clks_setup);
}
static void __init kona_dt_aon_ccu_setup(struct device_node *node)
{
- kona_dt_ccu_setup(node, bcm281xx_aon_ccu_clks_setup);
+ kona_dt_ccu_setup(&aon_ccu_data, node, bcm281xx_aon_ccu_clks_setup);
}
static void __init kona_dt_hub_ccu_setup(struct device_node *node)
{
- kona_dt_ccu_setup(node, bcm281xx_hub_ccu_clks_setup);
+ kona_dt_ccu_setup(&hub_ccu_data, node, bcm281xx_hub_ccu_clks_setup);
}
static void __init kona_dt_master_ccu_setup(struct device_node *node)
{
- kona_dt_ccu_setup(node, bcm281xx_master_ccu_clks_setup);
+ kona_dt_ccu_setup(&master_ccu_data, node,
+ bcm281xx_master_ccu_clks_setup);
}
static void __init kona_dt_slave_ccu_setup(struct device_node *node)
{
- kona_dt_ccu_setup(node, bcm281xx_slave_ccu_clks_setup);
+ kona_dt_ccu_setup(&slave_ccu_data, node,
+ bcm281xx_slave_ccu_clks_setup);
}
CLK_OF_DECLARE(bcm281xx_root_ccu, BCM281XX_DT_ROOT_CCU_COMPAT,
diff --git a/drivers/clk/bcm/clk-kona-setup.c b/drivers/clk/bcm/clk-kona-setup.c
index 9e7a9c1..4d1ca53 100644
--- a/drivers/clk/bcm/clk-kona-setup.c
+++ b/drivers/clk/bcm/clk-kona-setup.c
@@ -675,50 +675,49 @@ static void ccu_clks_teardown(struct ccu_data *ccu)
{
u32 i;
- for (i = 0; i < ccu->data.clk_num; i++)
- kona_clk_teardown(ccu->data.clks[i]);
- kfree(ccu->data.clks);
+ for (i = 0; i < ccu->clk_data.clk_num; i++)
+ kona_clk_teardown(ccu->clk_data.clks[i]);
+ kfree(ccu->clk_data.clks);
}
static void kona_ccu_teardown(struct ccu_data *ccu)
{
- if (!ccu)
- return;
-
+ kfree(ccu->clk_data.clks);
+ ccu->clk_data.clks = NULL;
if (!ccu->base)
- goto done;
+ return;
of_clk_del_provider(ccu->node); /* safe if never added */
ccu_clks_teardown(ccu);
list_del(&ccu->links);
of_node_put(ccu->node);
+ ccu->node = NULL;
iounmap(ccu->base);
-done:
- kfree(ccu->name);
- kfree(ccu);
+ ccu->base = NULL;
}
/*
* Set up a CCU. Call the provided ccu_clks_setup callback to
* initialize the array of clocks provided by the CCU.
*/
-void __init kona_dt_ccu_setup(struct device_node *node,
+void __init kona_dt_ccu_setup(struct ccu_data *ccu,
+ struct device_node *node,
int (*ccu_clks_setup)(struct ccu_data *))
{
- struct ccu_data *ccu;
struct resource res = { 0 };
resource_size_t range;
int ret;
- ccu = kzalloc(sizeof(*ccu), GFP_KERNEL);
- if (ccu)
- ccu->name = kstrdup(node->name, GFP_KERNEL);
- if (!ccu || !ccu->name) {
- pr_err("%s: unable to allocate CCU struct for %s\n",
- __func__, node->name);
- kfree(ccu);
+ if (ccu->clk_data.clk_num) {
+ size_t size;
- return;
+ size = ccu->clk_data.clk_num * sizeof(*ccu->clk_data.clks);
+ ccu->clk_data.clks = kzalloc(size, GFP_KERNEL);
+ if (!ccu->clk_data.clks) {
+ pr_err("%s: unable to allocate %u clocks for %s\n",
+ __func__, ccu->clk_data.clk_num, node->name);
+ return;
+ }
}
ret = of_address_to_resource(node, 0, &res);
@@ -742,18 +741,14 @@ void __init kona_dt_ccu_setup(struct device_node *node,
node->name);
goto out_err;
}
-
- spin_lock_init(&ccu->lock);
- INIT_LIST_HEAD(&ccu->links);
ccu->node = of_node_get(node);
-
list_add_tail(&ccu->links, &ccu_list);
- /* Set up clocks array (in ccu->data) */
+ /* Set up clocks array (in ccu->clk_data) */
if (ccu_clks_setup(ccu))
goto out_err;
- ret = of_clk_add_provider(node, of_clk_src_onecell_get, &ccu->data);
+ ret = of_clk_add_provider(node, of_clk_src_onecell_get, &ccu->clk_data);
if (ret) {
pr_err("%s: error adding ccu %s as provider (%d)\n", __func__,
node->name, ret);
diff --git a/drivers/clk/bcm/clk-kona.c b/drivers/clk/bcm/clk-kona.c
index bf0b70e..f8bc6bc 100644
--- a/drivers/clk/bcm/clk-kona.c
+++ b/drivers/clk/bcm/clk-kona.c
@@ -1020,13 +1020,13 @@ bool __init kona_ccu_init(struct ccu_data *ccu)
{
unsigned long flags;
unsigned int which;
- struct clk **clks = ccu->data.clks;
+ struct clk **clks = ccu->clk_data.clks;
bool success = true;
flags = ccu_lock(ccu);
__ccu_write_enable(ccu);
- for (which = 0; which < ccu->data.clk_num; which++) {
+ for (which = 0; which < ccu->clk_data.clk_num; which++) {
struct kona_clk *bcm_clk;
if (!clks[which])
diff --git a/drivers/clk/bcm/clk-kona.h b/drivers/clk/bcm/clk-kona.h
index 1a7eba4..108c264 100644
--- a/drivers/clk/bcm/clk-kona.h
+++ b/drivers/clk/bcm/clk-kona.h
@@ -85,11 +85,20 @@ struct ccu_data {
bool write_enabled; /* write access is currently enabled */
struct list_head links; /* for ccu_list */
struct device_node *node;
- struct clk_onecell_data data;
+ struct clk_onecell_data clk_data;
const char *name;
u32 range; /* byte range of address space */
};
+/* Initialization for common fields in a Kona ccu_data structure */
+#define KONA_CCU_COMMON(_prefix, _name, _ucase_name) \
+ .name = #_name "_ccu", \
+ .lock = __SPIN_LOCK_UNLOCKED(_name ## _ccu_data.lock), \
+ .links = LIST_HEAD_INIT(_name ## _ccu_data.links), \
+ .clk_data = { \
+ .clk_num = _prefix ## _ ## _ucase_name ## _CCU_CLOCK_COUNT, \
+ }
+
/*
* Gating control and status is managed by a 32-bit gate register.
*
@@ -390,8 +399,11 @@ extern struct clk_ops kona_peri_clk_ops;
/* Help functions */
-#define PERI_CLK_SETUP(clks, ccu, id, name) \
- clks[id] = kona_clk_setup(ccu, #name, bcm_clk_peri, &name ## _data)
+#define KONA_CLK_SETUP(_ccu, _type, _name) \
+ kona_clk_setup((_ccu), #_name, bcm_clk_## _type, &_name ## _data)
+
+#define PERI_CLK_SETUP(_ccu, _id, _name) \
+ (_ccu)->clk_data.clks[_id] = KONA_CLK_SETUP((_ccu), peri, _name)
/* Externally visible functions */
@@ -402,7 +414,8 @@ extern u64 scaled_div_build(struct bcm_clk_div *div, u32 div_value,
extern struct clk *kona_clk_setup(struct ccu_data *ccu, const char *name,
enum bcm_clk_type type, void *data);
-extern void __init kona_dt_ccu_setup(struct device_node *node,
+extern void __init kona_dt_ccu_setup(struct ccu_data *ccu,
+ struct device_node *node,
int (*ccu_clks_setup)(struct ccu_data *));
extern bool __init kona_ccu_init(struct ccu_data *ccu);
--
1.7.9.5
^ permalink raw reply related [flat|nested] 8+ messages in thread* [PATCH v4 5/7] clk: bcm281xx: define CCU clock data statically
2014-04-08 21:43 [PATCH v4 0/7] clk: bcm281xx: updates Alex Elder
` (3 preceding siblings ...)
2014-04-08 21:43 ` [PATCH v4 4/7] clk: bcm281xx: initialize CCU structures statically Alex Elder
@ 2014-04-08 21:43 ` Alex Elder
2014-04-08 21:43 ` [PATCH v4 6/7] clk: bcm281xx: add clock policy support Alex Elder
2014-04-08 21:43 ` [PATCH v4 7/7] clk: bcm281xx: add clock hysteresis support Alex Elder
6 siblings, 0 replies; 8+ messages in thread
From: Alex Elder @ 2014-04-08 21:43 UTC (permalink / raw)
To: linux-arm-kernel
Rather than "manually" setting up each CCU's clock entries at run
time, define a flexible array of generic Kona clock structures
within the CCU structure itself. Each of these entries contains
generic kona clock information (like its CCU pointer and clock
framework initialization data). Each also has a pointer to a
structure contianing clock type-dependent initialization data
(like register definitions).
Since we'll iterate over these arrays we need to be sure they have
slots for all potential clock index values. (E.g. for the root CCU
we must have at least BCM281XX_ROOT_CCU_CLOCK_COUNT slots.) To
ensure this we always define an extra entry and fill it using the
special initializer LAST_KONA_CLK.
Just about everything we need to know about a clock can be defined
statically. As a result, kona_clk_setup() can be changed to take
just a kona_clk structure as its argument, and peri_clk_setup() can
be simplified. With the information pre-defined we are also able
to handle most clock setup genericially. We can do away with the
CCU-specific callback functions that previously were needed to set
up the entries in CCU's clock array.
Move the definition of the ccu_data structure down in "clk-kona.h"
to avoid a forward dependency.
Signed-off-by: Alex Elder <elder@linaro.org>
---
drivers/clk/bcm/clk-bcm281xx.c | 132 ++++++++++++++++++--------------------
drivers/clk/bcm/clk-kona-setup.c | 60 ++++++++---------
drivers/clk/bcm/clk-kona.h | 86 +++++++++++++------------
3 files changed, 134 insertions(+), 144 deletions(-)
diff --git a/drivers/clk/bcm/clk-bcm281xx.c b/drivers/clk/bcm/clk-bcm281xx.c
index d72f2ae..71a65a4 100644
--- a/drivers/clk/bcm/clk-bcm281xx.c
+++ b/drivers/clk/bcm/clk-bcm281xx.c
@@ -41,6 +41,11 @@ static struct peri_clk_data frac_1m_data = {
static struct ccu_data root_ccu_data = {
BCM281XX_CCU_COMMON(root, ROOT),
+ .kona_clks = {
+ [BCM281XX_ROOT_CCU_FRAC_1M] =
+ KONA_CLK(root, frac_1m, peri),
+ [BCM281XX_ROOT_CCU_CLOCK_COUNT] = LAST_KONA_CLK,
+ },
};
/* AON CCU */
@@ -74,6 +79,15 @@ static struct peri_clk_data pmu_bsc_var_data = {
static struct ccu_data aon_ccu_data = {
BCM281XX_CCU_COMMON(aon, AON),
+ .kona_clks = {
+ [BCM281XX_AON_CCU_HUB_TIMER] =
+ KONA_CLK(aon, hub_timer, peri),
+ [BCM281XX_AON_CCU_PMU_BSC] =
+ KONA_CLK(aon, pmu_bsc, peri),
+ [BCM281XX_AON_CCU_PMU_BSC_VAR] =
+ KONA_CLK(aon, pmu_bsc_var, peri),
+ [BCM281XX_AON_CCU_CLOCK_COUNT] = LAST_KONA_CLK,
+ },
};
/* Hub CCU */
@@ -88,6 +102,11 @@ static struct peri_clk_data tmon_1m_data = {
static struct ccu_data hub_ccu_data = {
BCM281XX_CCU_COMMON(hub, HUB),
+ .kona_clks = {
+ [BCM281XX_HUB_CCU_TMON_1M] =
+ KONA_CLK(hub, tmon_1m, peri),
+ [BCM281XX_HUB_CCU_CLOCK_COUNT] = LAST_KONA_CLK,
+ },
};
/* Master CCU */
@@ -175,6 +194,23 @@ static struct peri_clk_data hsic2_12m_data = {
static struct ccu_data master_ccu_data = {
BCM281XX_CCU_COMMON(master, MASTER),
+ .kona_clks = {
+ [BCM281XX_MASTER_CCU_SDIO1] =
+ KONA_CLK(master, sdio1, peri),
+ [BCM281XX_MASTER_CCU_SDIO2] =
+ KONA_CLK(master, sdio2, peri),
+ [BCM281XX_MASTER_CCU_SDIO3] =
+ KONA_CLK(master, sdio3, peri),
+ [BCM281XX_MASTER_CCU_SDIO4] =
+ KONA_CLK(master, sdio4, peri),
+ [BCM281XX_MASTER_CCU_USB_IC] =
+ KONA_CLK(master, usb_ic, peri),
+ [BCM281XX_MASTER_CCU_HSIC2_48M] =
+ KONA_CLK(master, hsic2_48m, peri),
+ [BCM281XX_MASTER_CCU_HSIC2_12M] =
+ KONA_CLK(master, hsic2_12m, peri),
+ [BCM281XX_MASTER_CCU_CLOCK_COUNT] = LAST_KONA_CLK,
+ },
};
/* Slave CCU */
@@ -287,96 +323,56 @@ static struct peri_clk_data pwm_data = {
static struct ccu_data slave_ccu_data = {
BCM281XX_CCU_COMMON(slave, SLAVE),
+ .kona_clks = {
+ [BCM281XX_SLAVE_CCU_UARTB] =
+ KONA_CLK(slave, uartb, peri),
+ [BCM281XX_SLAVE_CCU_UARTB2] =
+ KONA_CLK(slave, uartb2, peri),
+ [BCM281XX_SLAVE_CCU_UARTB3] =
+ KONA_CLK(slave, uartb3, peri),
+ [BCM281XX_SLAVE_CCU_UARTB4] =
+ KONA_CLK(slave, uartb4, peri),
+ [BCM281XX_SLAVE_CCU_SSP0] =
+ KONA_CLK(slave, ssp0, peri),
+ [BCM281XX_SLAVE_CCU_SSP2] =
+ KONA_CLK(slave, ssp2, peri),
+ [BCM281XX_SLAVE_CCU_BSC1] =
+ KONA_CLK(slave, bsc1, peri),
+ [BCM281XX_SLAVE_CCU_BSC2] =
+ KONA_CLK(slave, bsc2, peri),
+ [BCM281XX_SLAVE_CCU_BSC3] =
+ KONA_CLK(slave, bsc3, peri),
+ [BCM281XX_SLAVE_CCU_PWM] =
+ KONA_CLK(slave, pwm, peri),
+ [BCM281XX_SLAVE_CCU_CLOCK_COUNT] = LAST_KONA_CLK,
+ },
};
-/*
- * CCU setup routines
- *
- * These are called from kona_dt_ccu_setup() to initialize the array
- * of clocks provided by the CCU. Once allocated, the entries in
- * the array are initialized by calling kona_clk_setup() with the
- * initialization data for each clock. They return 0 if successful
- * or an error code otherwise.
- */
-static int __init bcm281xx_root_ccu_clks_setup(struct ccu_data *ccu)
-{
- PERI_CLK_SETUP(ccu, BCM281XX_ROOT_CCU_FRAC_1M, frac_1m);
-
- return 0;
-}
-
-static int __init bcm281xx_aon_ccu_clks_setup(struct ccu_data *ccu)
-{
- PERI_CLK_SETUP(ccu, BCM281XX_AON_CCU_HUB_TIMER, hub_timer);
- PERI_CLK_SETUP(ccu, BCM281XX_AON_CCU_PMU_BSC, pmu_bsc);
- PERI_CLK_SETUP(ccu, BCM281XX_AON_CCU_PMU_BSC_VAR, pmu_bsc_var);
-
- return 0;
-}
-
-static int __init bcm281xx_hub_ccu_clks_setup(struct ccu_data *ccu)
-{
- PERI_CLK_SETUP(ccu, BCM281XX_HUB_CCU_TMON_1M, tmon_1m);
-
- return 0;
-}
-
-static int __init bcm281xx_master_ccu_clks_setup(struct ccu_data *ccu)
-{
- PERI_CLK_SETUP(ccu, BCM281XX_MASTER_CCU_SDIO1, sdio1);
- PERI_CLK_SETUP(ccu, BCM281XX_MASTER_CCU_SDIO2, sdio2);
- PERI_CLK_SETUP(ccu, BCM281XX_MASTER_CCU_SDIO3, sdio3);
- PERI_CLK_SETUP(ccu, BCM281XX_MASTER_CCU_SDIO4, sdio4);
- PERI_CLK_SETUP(ccu, BCM281XX_MASTER_CCU_USB_IC, usb_ic);
- PERI_CLK_SETUP(ccu, BCM281XX_MASTER_CCU_HSIC2_48M, hsic2_48m);
- PERI_CLK_SETUP(ccu, BCM281XX_MASTER_CCU_HSIC2_12M, hsic2_12m);
-
- return 0;
-}
-
-static int __init bcm281xx_slave_ccu_clks_setup(struct ccu_data *ccu)
-{
- PERI_CLK_SETUP(ccu, BCM281XX_SLAVE_CCU_UARTB, uartb);
- PERI_CLK_SETUP(ccu, BCM281XX_SLAVE_CCU_UARTB2, uartb2);
- PERI_CLK_SETUP(ccu, BCM281XX_SLAVE_CCU_UARTB3, uartb3);
- PERI_CLK_SETUP(ccu, BCM281XX_SLAVE_CCU_UARTB4, uartb4);
- PERI_CLK_SETUP(ccu, BCM281XX_SLAVE_CCU_SSP0, ssp0);
- PERI_CLK_SETUP(ccu, BCM281XX_SLAVE_CCU_SSP2, ssp2);
- PERI_CLK_SETUP(ccu, BCM281XX_SLAVE_CCU_BSC1, bsc1);
- PERI_CLK_SETUP(ccu, BCM281XX_SLAVE_CCU_BSC2, bsc2);
- PERI_CLK_SETUP(ccu, BCM281XX_SLAVE_CCU_BSC3, bsc3);
- PERI_CLK_SETUP(ccu, BCM281XX_SLAVE_CCU_PWM, pwm);
-
- return 0;
-}
-
/* Device tree match table callback functions */
static void __init kona_dt_root_ccu_setup(struct device_node *node)
{
- kona_dt_ccu_setup(&root_ccu_data, node, bcm281xx_root_ccu_clks_setup);
+ kona_dt_ccu_setup(&root_ccu_data, node);
}
static void __init kona_dt_aon_ccu_setup(struct device_node *node)
{
- kona_dt_ccu_setup(&aon_ccu_data, node, bcm281xx_aon_ccu_clks_setup);
+ kona_dt_ccu_setup(&aon_ccu_data, node);
}
static void __init kona_dt_hub_ccu_setup(struct device_node *node)
{
- kona_dt_ccu_setup(&hub_ccu_data, node, bcm281xx_hub_ccu_clks_setup);
+ kona_dt_ccu_setup(&hub_ccu_data, node);
}
static void __init kona_dt_master_ccu_setup(struct device_node *node)
{
- kona_dt_ccu_setup(&master_ccu_data, node,
- bcm281xx_master_ccu_clks_setup);
+ kona_dt_ccu_setup(&master_ccu_data, node);
}
static void __init kona_dt_slave_ccu_setup(struct device_node *node)
{
- kona_dt_ccu_setup(&slave_ccu_data, node,
- bcm281xx_slave_ccu_clks_setup);
+ kona_dt_ccu_setup(&slave_ccu_data, node);
}
CLK_OF_DECLARE(bcm281xx_root_ccu, BCM281XX_DT_ROOT_CCU_COMPAT,
diff --git a/drivers/clk/bcm/clk-kona-setup.c b/drivers/clk/bcm/clk-kona-setup.c
index 4d1ca53..825a2f2 100644
--- a/drivers/clk/bcm/clk-kona-setup.c
+++ b/drivers/clk/bcm/clk-kona-setup.c
@@ -567,7 +567,6 @@ static void peri_clk_teardown(struct peri_clk_data *data,
struct clk_init_data *init_data)
{
clk_sel_teardown(&data->sel, init_data);
- init_data->ops = NULL;
}
/*
@@ -576,10 +575,9 @@ static void peri_clk_teardown(struct peri_clk_data *data,
* that can be assigned if the clock has one or more parent clocks
* associated with it.
*/
-static int peri_clk_setup(struct ccu_data *ccu, struct peri_clk_data *data,
- struct clk_init_data *init_data)
+static int
+peri_clk_setup(struct peri_clk_data *data, struct clk_init_data *init_data)
{
- init_data->ops = &kona_peri_clk_ops;
init_data->flags = CLK_IGNORE_UNUSED;
return clk_sel_setup(data->clocks, &data->sel, init_data);
@@ -617,39 +615,26 @@ static void kona_clk_teardown(struct clk *clk)
bcm_clk_teardown(bcm_clk);
}
-struct clk *kona_clk_setup(struct ccu_data *ccu, const char *name,
- enum bcm_clk_type type, void *data)
+struct clk *kona_clk_setup(struct kona_clk *bcm_clk)
{
- struct kona_clk *bcm_clk;
- struct clk_init_data *init_data;
+ struct clk_init_data *init_data = &bcm_clk->init_data;
struct clk *clk = NULL;
- bcm_clk = kzalloc(sizeof(*bcm_clk), GFP_KERNEL);
- if (!bcm_clk) {
- pr_err("%s: failed to allocate bcm_clk for %s\n", __func__,
- name);
- return NULL;
- }
- bcm_clk->ccu = ccu;
- bcm_clk->init_data.name = name;
-
- init_data = &bcm_clk->init_data;
- init_data->name = name;
- switch (type) {
+ switch (bcm_clk->type) {
case bcm_clk_peri:
- if (peri_clk_setup(ccu, data, init_data))
- goto out_free;
+ if (peri_clk_setup(bcm_clk->u.data, init_data))
+ return NULL;
break;
default:
- data = NULL;
- break;
+ pr_err("%s: clock type %d invalid for %s\n", __func__,
+ (int)bcm_clk->type, init_data->name);
+ return NULL;
}
- bcm_clk->type = type;
- bcm_clk->u.data = data;
/* Make sure everything makes sense before we set it up */
if (!kona_clk_valid(bcm_clk)) {
- pr_err("%s: clock data invalid for %s\n", __func__, name);
+ pr_err("%s: clock data invalid for %s\n", __func__,
+ init_data->name);
goto out_teardown;
}
@@ -657,7 +642,7 @@ struct clk *kona_clk_setup(struct ccu_data *ccu, const char *name,
clk = clk_register(NULL, &bcm_clk->hw);
if (IS_ERR(clk)) {
pr_err("%s: error registering clock %s (%ld)\n", __func__,
- name, PTR_ERR(clk));
+ init_data->name, PTR_ERR(clk));
goto out_teardown;
}
BUG_ON(!clk);
@@ -665,8 +650,6 @@ struct clk *kona_clk_setup(struct ccu_data *ccu, const char *name,
return clk;
out_teardown:
bcm_clk_teardown(bcm_clk);
-out_free:
- kfree(bcm_clk);
return NULL;
}
@@ -701,11 +684,11 @@ static void kona_ccu_teardown(struct ccu_data *ccu)
* initialize the array of clocks provided by the CCU.
*/
void __init kona_dt_ccu_setup(struct ccu_data *ccu,
- struct device_node *node,
- int (*ccu_clks_setup)(struct ccu_data *))
+ struct device_node *node)
{
struct resource res = { 0 };
resource_size_t range;
+ unsigned int i;
int ret;
if (ccu->clk_data.clk_num) {
@@ -744,9 +727,16 @@ void __init kona_dt_ccu_setup(struct ccu_data *ccu,
ccu->node = of_node_get(node);
list_add_tail(&ccu->links, &ccu_list);
- /* Set up clocks array (in ccu->clk_data) */
- if (ccu_clks_setup(ccu))
- goto out_err;
+ /*
+ * Set up each defined kona clock and save the result in
+ * the clock framework clock array (in ccu->data). Then
+ * register as a provider for these clocks.
+ */
+ for (i = 0; i < ccu->clk_data.clk_num; i++) {
+ if (!ccu->kona_clks[i].ccu)
+ continue;
+ ccu->clk_data.clks[i] = kona_clk_setup(&ccu->kona_clks[i]);
+ }
ret = of_clk_add_provider(node, of_clk_src_onecell_get, &ccu->clk_data);
if (ret) {
diff --git a/drivers/clk/bcm/clk-kona.h b/drivers/clk/bcm/clk-kona.h
index 108c264..05d7477 100644
--- a/drivers/clk/bcm/clk-kona.h
+++ b/drivers/clk/bcm/clk-kona.h
@@ -71,35 +71,6 @@ enum bcm_clk_type {
};
/*
- * Each CCU defines a mapped area of memory containing registers
- * used to manage clocks implemented by the CCU. Access to memory
- * within the CCU's space is serialized by a spinlock. Before any
- * (other) address can be written, a special access "password" value
- * must be written to its WR_ACCESS register (located at the base
- * address of the range). We keep track of the name of each CCU as
- * it is set up, and maintain them in a list.
- */
-struct ccu_data {
- void __iomem *base; /* base of mapped address space */
- spinlock_t lock; /* serialization lock */
- bool write_enabled; /* write access is currently enabled */
- struct list_head links; /* for ccu_list */
- struct device_node *node;
- struct clk_onecell_data clk_data;
- const char *name;
- u32 range; /* byte range of address space */
-};
-
-/* Initialization for common fields in a Kona ccu_data structure */
-#define KONA_CCU_COMMON(_prefix, _name, _ucase_name) \
- .name = #_name "_ccu", \
- .lock = __SPIN_LOCK_UNLOCKED(_name ## _ccu_data.lock), \
- .links = LIST_HEAD_INIT(_name ## _ccu_data.links), \
- .clk_data = { \
- .clk_num = _prefix ## _ ## _ucase_name ## _CCU_CLOCK_COUNT, \
- }
-
-/*
* Gating control and status is managed by a 32-bit gate register.
*
* There are several types of gating available:
@@ -393,18 +364,53 @@ struct kona_clk {
#define to_kona_clk(_hw) \
container_of(_hw, struct kona_clk, hw)
+/* Initialization macro for an entry in a CCU's kona_clks[] array. */
+#define KONA_CLK(_ccu_name, _clk_name, _type) \
+ { \
+ .init_data = { \
+ .name = #_clk_name, \
+ .ops = &kona_ ## _type ## _clk_ops, \
+ }, \
+ .ccu = &_ccu_name ## _ccu_data, \
+ .type = bcm_clk_ ## _type, \
+ .u.data = &_clk_name ## _data, \
+ }
+#define LAST_KONA_CLK { .type = bcm_clk_none }
+
+/*
+ * Each CCU defines a mapped area of memory containing registers
+ * used to manage clocks implemented by the CCU. Access to memory
+ * within the CCU's space is serialized by a spinlock. Before any
+ * (other) address can be written, a special access "password" value
+ * must be written to its WR_ACCESS register (located at the base
+ * address of the range). We keep track of the name of each CCU as
+ * it is set up, and maintain them in a list.
+ */
+struct ccu_data {
+ void __iomem *base; /* base of mapped address space */
+ spinlock_t lock; /* serialization lock */
+ bool write_enabled; /* write access is currently enabled */
+ struct list_head links; /* for ccu_list */
+ struct device_node *node;
+ struct clk_onecell_data clk_data;
+ const char *name;
+ u32 range; /* byte range of address space */
+ struct kona_clk kona_clks[]; /* must be last */
+};
+
+/* Initialization for common fields in a Kona ccu_data structure */
+#define KONA_CCU_COMMON(_prefix, _name, _ccuname) \
+ .name = #_name "_ccu", \
+ .lock = __SPIN_LOCK_UNLOCKED(_name ## _ccu_data.lock), \
+ .links = LIST_HEAD_INIT(_name ## _ccu_data.links), \
+ .clk_data = { \
+ .clk_num = _prefix ## _ ## _ccuname ## _CCU_CLOCK_COUNT, \
+ }
+
/* Exported globals */
extern struct clk_ops kona_peri_clk_ops;
-/* Help functions */
-
-#define KONA_CLK_SETUP(_ccu, _type, _name) \
- kona_clk_setup((_ccu), #_name, bcm_clk_## _type, &_name ## _data)
-
-#define PERI_CLK_SETUP(_ccu, _id, _name) \
- (_ccu)->clk_data.clks[_id] = KONA_CLK_SETUP((_ccu), peri, _name)
-
/* Externally visible functions */
extern u64 do_div_round_closest(u64 dividend, unsigned long divisor);
@@ -412,11 +418,9 @@ extern u64 scaled_div_max(struct bcm_clk_div *div);
extern u64 scaled_div_build(struct bcm_clk_div *div, u32 div_value,
u32 billionths);
-extern struct clk *kona_clk_setup(struct ccu_data *ccu, const char *name,
- enum bcm_clk_type type, void *data);
+extern struct clk *kona_clk_setup(struct kona_clk *bcm_clk);
extern void __init kona_dt_ccu_setup(struct ccu_data *ccu,
- struct device_node *node,
- int (*ccu_clks_setup)(struct ccu_data *));
+ struct device_node *node);
extern bool __init kona_ccu_init(struct ccu_data *ccu);
#endif /* _CLK_KONA_H */
--
1.7.9.5
^ permalink raw reply related [flat|nested] 8+ messages in thread* [PATCH v4 6/7] clk: bcm281xx: add clock policy support
2014-04-08 21:43 [PATCH v4 0/7] clk: bcm281xx: updates Alex Elder
` (4 preceding siblings ...)
2014-04-08 21:43 ` [PATCH v4 5/7] clk: bcm281xx: define CCU clock data statically Alex Elder
@ 2014-04-08 21:43 ` Alex Elder
2014-04-08 21:43 ` [PATCH v4 7/7] clk: bcm281xx: add clock hysteresis support Alex Elder
6 siblings, 0 replies; 8+ messages in thread
From: Alex Elder @ 2014-04-08 21:43 UTC (permalink / raw)
To: linux-arm-kernel
Add support for CCU policy engine control, and also for setting the
mask bits for bus clocks that require a policy change to get
activated. This includes adding validity checking framework for
CCUs, to validate the policy fields if defined.
Signed-off-by: Alex Elder <elder@linaro.org>
---
drivers/clk/bcm/clk-kona-setup.c | 92 ++++++++++++++++++++++
drivers/clk/bcm/clk-kona.c | 155 ++++++++++++++++++++++++++++++++++++++
drivers/clk/bcm/clk-kona.h | 71 +++++++++++++++++
3 files changed, 318 insertions(+)
diff --git a/drivers/clk/bcm/clk-kona-setup.c b/drivers/clk/bcm/clk-kona-setup.c
index 825a2f2..773ad7c 100644
--- a/drivers/clk/bcm/clk-kona-setup.c
+++ b/drivers/clk/bcm/clk-kona-setup.c
@@ -25,6 +25,31 @@ LIST_HEAD(ccu_list); /* The list of set up CCUs */
/* Validity checking */
+static bool ccu_data_offsets_valid(struct ccu_data *ccu)
+{
+ struct ccu_policy *ccu_policy = &ccu->policy;
+ u32 limit;
+
+ limit = ccu->range - sizeof(u32);
+ limit = round_down(limit, sizeof(u32));
+ if (ccu_policy_exists(ccu_policy)) {
+ if (ccu_policy->enable.offset > limit) {
+ pr_err("%s: bad policy enable offset for %s "
+ "(%u > %u)\n", __func__,
+ ccu->name, ccu_policy->enable.offset, limit);
+ return false;
+ }
+ if (ccu_policy->control.offset > limit) {
+ pr_err("%s: bad policy control offset for %s "
+ "(%u > %u)\n", __func__,
+ ccu->name, ccu_policy->control.offset, limit);
+ return false;
+ }
+ }
+
+ return true;
+}
+
static bool clk_requires_trigger(struct kona_clk *bcm_clk)
{
struct peri_clk_data *peri = bcm_clk->u.peri;
@@ -54,6 +79,7 @@ static bool clk_requires_trigger(struct kona_clk *bcm_clk)
static bool peri_clk_data_offsets_valid(struct kona_clk *bcm_clk)
{
struct peri_clk_data *peri;
+ struct bcm_clk_policy *policy;
struct bcm_clk_gate *gate;
struct bcm_clk_div *div;
struct bcm_clk_sel *sel;
@@ -70,6 +96,15 @@ static bool peri_clk_data_offsets_valid(struct kona_clk *bcm_clk)
limit = range - sizeof(u32);
limit = round_down(limit, sizeof(u32));
+ policy = &peri->policy;
+ if (policy_exists(policy)) {
+ if (policy->offset > limit) {
+ pr_err("%s: bad policy offset for %s (%u > %u)\n",
+ __func__, name, policy->offset, limit);
+ return false;
+ }
+ }
+
gate = &peri->gate;
if (gate_exists(gate)) {
if (gate->offset > limit) {
@@ -167,6 +202,36 @@ static bool bitfield_valid(u32 shift, u32 width, const char *field_name,
return true;
}
+static bool
+ccu_policy_valid(struct ccu_policy *ccu_policy, const char *ccu_name)
+{
+ struct bcm_lvm_en *enable = &ccu_policy->enable;
+ struct bcm_policy_ctl *control;
+
+ if (!bit_posn_valid(enable->bit, "policy enable", ccu_name))
+ return false;
+
+ control = &ccu_policy->control;
+ if (!bit_posn_valid(control->go_bit, "policy control GO", ccu_name))
+ return false;
+
+ if (!bit_posn_valid(control->atl_bit, "policy control ATL", ccu_name))
+ return false;
+
+ if (!bit_posn_valid(control->ac_bit, "policy control AC", ccu_name))
+ return false;
+
+ return true;
+}
+
+static bool policy_valid(struct bcm_clk_policy *policy, const char *clock_name)
+{
+ if (!bit_posn_valid(policy->bit, "policy", clock_name))
+ return false;
+
+ return true;
+}
+
/*
* All gates, if defined, have a status bit, and for hardware-only
* gates, that's it. Gates that can be software controlled also
@@ -312,6 +377,7 @@ static bool
peri_clk_data_valid(struct kona_clk *bcm_clk)
{
struct peri_clk_data *peri;
+ struct bcm_clk_policy *policy;
struct bcm_clk_gate *gate;
struct bcm_clk_sel *sel;
struct bcm_clk_div *div;
@@ -331,6 +397,11 @@ peri_clk_data_valid(struct kona_clk *bcm_clk)
peri = bcm_clk->u.peri;
name = bcm_clk->init_data.name;
+
+ policy = &peri->policy;
+ if (policy_exists(policy) && !policy_valid(policy, name))
+ return false;
+
gate = &peri->gate;
if (gate_exists(gate) && !gate_valid(gate, "gate", name))
return false;
@@ -679,6 +750,21 @@ static void kona_ccu_teardown(struct ccu_data *ccu)
ccu->base = NULL;
}
+static bool ccu_data_valid(struct ccu_data *ccu)
+{
+ struct ccu_policy *ccu_policy;
+
+ if (!ccu_data_offsets_valid(ccu))
+ return false;
+
+ ccu_policy = &ccu->policy;
+ if (ccu_policy_exists(ccu_policy))
+ if (!ccu_policy_valid(ccu_policy, ccu->name))
+ return false;
+
+ return true;
+}
+
/*
* Set up a CCU. Call the provided ccu_clks_setup callback to
* initialize the array of clocks provided by the CCU.
@@ -718,6 +804,12 @@ void __init kona_dt_ccu_setup(struct ccu_data *ccu,
}
ccu->range = (u32)range;
+
+ if (!ccu_data_valid(ccu)) {
+ pr_err("%s: ccu data not valid for %s\n", __func__, node->name);
+ goto out_err;
+ }
+
ccu->base = ioremap(res.start, ccu->range);
if (!ccu->base) {
pr_err("%s: unable to map CCU registers for %s\n", __func__,
diff --git a/drivers/clk/bcm/clk-kona.c b/drivers/clk/bcm/clk-kona.c
index f8bc6bc..7d90c34 100644
--- a/drivers/clk/bcm/clk-kona.c
+++ b/drivers/clk/bcm/clk-kona.c
@@ -16,6 +16,14 @@
#include <linux/delay.h>
+/*
+ * "Policies" affect the frequencies of bus clocks provided by a
+ * CCU. (I believe these polices are named "Deep Sleep", "Economy",
+ * "Normal", and "Turbo".) A lower policy number has lower power
+ * consumption, and policy 2 is the default.
+ */
+#define CCU_POLICY_COUNT 4
+
#define CCU_ACCESS_PASSWORD 0xA5A500
#define CLK_GATE_DELAY_LOOP 2000
@@ -213,6 +221,148 @@ __ccu_wait_bit(struct ccu_data *ccu, u32 reg_offset, u32 bit, bool want)
return false;
}
+/* Policy operations */
+
+static bool __ccu_policy_engine_start(struct ccu_data *ccu, bool sync)
+{
+ struct bcm_policy_ctl *control = &ccu->policy.control;
+ u32 offset;
+ u32 go_bit;
+ u32 mask;
+ bool ret;
+
+ /* If we don't need to control policy for this CCU, we're done. */
+ if (!policy_ctl_exists(control))
+ return true;
+
+ offset = control->offset;
+ go_bit = control->go_bit;
+
+ /* Ensure we're not busy before we start */
+ ret = __ccu_wait_bit(ccu, offset, go_bit, false);
+ if (!ret) {
+ pr_err("%s: ccu %s policy engine wouldn't go idle\n",
+ __func__, ccu->name);
+ return false;
+ }
+
+ /*
+ * If it's a synchronous request, we'll wait for the voltage
+ * and frequency of the active load to stabilize before
+ * returning. To do this we select the active load by
+ * setting the ATL bit.
+ *
+ * An asynchronous request instead ramps the voltage in the
+ * background, and when that process stabilizes, the target
+ * load is copied to the active load and the CCU frequency
+ * is switched. We do this by selecting the target load
+ * (ATL bit clear) and setting the request auto-copy (AC bit
+ * set).
+ *
+ * Note, we do NOT read-modify-write this register.
+ */
+ mask = (u32)1 << go_bit;
+ if (sync)
+ mask |= 1 << control->atl_bit;
+ else
+ mask |= 1 << control->ac_bit;
+ __ccu_write(ccu, offset, mask);
+
+ /* Wait for indication that operation is complete. */
+ ret = __ccu_wait_bit(ccu, offset, go_bit, false);
+ if (!ret)
+ pr_err("%s: ccu %s policy engine never started\n",
+ __func__, ccu->name);
+
+ return ret;
+}
+
+static bool __ccu_policy_engine_stop(struct ccu_data *ccu)
+{
+ struct bcm_lvm_en *enable = &ccu->policy.enable;
+ u32 offset;
+ u32 enable_bit;
+ bool ret;
+
+ /* If we don't need to control policy for this CCU, we're done. */
+ if (!policy_lvm_en_exists(enable))
+ return true;
+
+ /* Ensure we're not busy before we start */
+ offset = enable->offset;
+ enable_bit = enable->bit;
+ ret = __ccu_wait_bit(ccu, offset, enable_bit, false);
+ if (!ret) {
+ pr_err("%s: ccu %s policy engine already stopped\n",
+ __func__, ccu->name);
+ return false;
+ }
+
+ /* Now set the bit to stop the engine (NO read-modify-write) */
+ __ccu_write(ccu, offset, (u32)1 << enable_bit);
+
+ /* Wait for indication that it has stopped. */
+ ret = __ccu_wait_bit(ccu, offset, enable_bit, false);
+ if (!ret)
+ pr_err("%s: ccu %s policy engine never stopped\n",
+ __func__, ccu->name);
+
+ return ret;
+}
+
+/*
+ * A CCU has four operating conditions ("policies"), and some clocks
+ * can be disabled or enabled based on which policy is currently in
+ * effect. Such clocks have a bit in a "policy mask" register for
+ * each policy indicating whether the clock is enabled for that
+ * policy or not. The bit position for a clock is the same for all
+ * four registers, and the 32-bit registers are at consecutive
+ * addresses.
+ */
+static bool policy_init(struct ccu_data *ccu, struct bcm_clk_policy *policy)
+{
+ u32 offset;
+ u32 mask;
+ int i;
+ bool ret;
+
+ if (!policy_exists(policy))
+ return true;
+
+ /*
+ * We need to stop the CCU policy engine to allow update
+ * of our policy bits.
+ */
+ if (!__ccu_policy_engine_stop(ccu)) {
+ pr_err("%s: unable to stop CCU %s policy engine\n",
+ __func__, ccu->name);
+ return false;
+ }
+
+ /*
+ * For now, if a clock defines its policy bit we just mark
+ * it "enabled" for all four policies.
+ */
+ offset = policy->offset;
+ mask = (u32)1 << policy->bit;
+ for (i = 0; i < CCU_POLICY_COUNT; i++) {
+ u32 reg_val;
+
+ reg_val = __ccu_read(ccu, offset);
+ reg_val |= mask;
+ __ccu_write(ccu, offset, reg_val);
+ offset += sizeof(u32);
+ }
+
+ /* We're done updating; fire up the policy engine again. */
+ ret = __ccu_policy_engine_start(ccu, true);
+ if (!ret)
+ pr_err("%s: unable to restart CCU %s policy engine\n",
+ __func__, ccu->name);
+
+ return ret;
+}
+
/* Gate operations */
/* Determine whether a clock is gated. CCU lock must be held. */
@@ -972,6 +1122,11 @@ static bool __peri_clk_init(struct kona_clk *bcm_clk)
BUG_ON(bcm_clk->type != bcm_clk_peri);
+ if (!policy_init(ccu, &peri->policy)) {
+ pr_err("%s: error initializing policy for %s\n",
+ __func__, name);
+ return false;
+ }
if (!gate_init(ccu, &peri->gate)) {
pr_err("%s: error initializing gate for %s\n", __func__, name);
return false;
diff --git a/drivers/clk/bcm/clk-kona.h b/drivers/clk/bcm/clk-kona.h
index 05d7477..4bcba13 100644
--- a/drivers/clk/bcm/clk-kona.h
+++ b/drivers/clk/bcm/clk-kona.h
@@ -43,8 +43,14 @@
#define FLAG_FLIP(obj, type, flag) ((obj)->flags ^= FLAG(type, flag))
#define FLAG_TEST(obj, type, flag) (!!((obj)->flags & FLAG(type, flag)))
+/* CCU field state tests */
+
+#define ccu_policy_exists(ccu_policy) ((ccu_policy)->enable.offset != 0)
+
/* Clock field state tests */
+#define policy_exists(policy) ((policy)->offset != 0)
+
#define gate_exists(gate) FLAG_TEST(gate, GATE, EXISTS)
#define gate_is_enabled(gate) FLAG_TEST(gate, GATE, ENABLED)
#define gate_is_hw_controllable(gate) FLAG_TEST(gate, GATE, HW)
@@ -62,6 +68,9 @@
#define selector_exists(sel) ((sel)->width != 0)
#define trigger_exists(trig) FLAG_TEST(trig, TRIG, EXISTS)
+#define policy_lvm_en_exists(enable) ((enable)->offset != 0)
+#define policy_ctl_exists(control) ((control)->offset != 0)
+
/* Clock type, used to tell common block what it's part of */
enum bcm_clk_type {
bcm_clk_none, /* undefined clock type */
@@ -71,6 +80,27 @@ enum bcm_clk_type {
};
/*
+ * CCU policy control for clocks. Clocks can be enabled or disabled
+ * based on the CCU policy in effect. One bit in each policy mask
+ * register (one per CCU policy) represents whether the clock is
+ * enabled when that policy is effect or not. The CCU policy engine
+ * must be stopped to update these bits, and must be restarted again
+ * afterward.
+ */
+struct bcm_clk_policy {
+ u32 offset; /* first policy mask register offset */
+ u32 bit; /* bit used in all mask registers */
+};
+
+/* Policy initialization macro */
+
+#define POLICY(_offset, _bit) \
+ { \
+ .offset = (_offset), \
+ .bit = (_bit), \
+ }
+
+/*
* Gating control and status is managed by a 32-bit gate register.
*
* There are several types of gating available:
@@ -340,6 +370,7 @@ struct bcm_clk_trig {
}
struct peri_clk_data {
+ struct bcm_clk_policy policy;
struct bcm_clk_gate gate;
struct bcm_clk_trig pre_trig;
struct bcm_clk_div pre_div;
@@ -378,6 +409,45 @@ struct kona_clk {
#define LAST_KONA_CLK { .type = bcm_clk_none }
/*
+ * CCU policy control. To enable software update of the policy
+ * tables the CCU policy engine must be stopped by setting the
+ * software update enable bit (LVM_EN). After an update the engine
+ * is restarted using the GO bit and either the GO_ATL or GO_AC bit.
+ */
+struct bcm_lvm_en {
+ u32 offset; /* LVM_EN register offset */
+ u32 bit; /* POLICY_CONFIG_EN bit in register */
+};
+
+/* Policy enable initialization macro */
+#define CCU_LVM_EN(_offset, _bit) \
+ { \
+ .offset = (_offset), \
+ .bit = (_bit), \
+ }
+
+struct bcm_policy_ctl {
+ u32 offset; /* POLICY_CTL register offset */
+ u32 go_bit;
+ u32 atl_bit; /* GO, GO_ATL, and GO_AC bits */
+ u32 ac_bit;
+};
+
+/* Policy control initialization macro */
+#define CCU_POLICY_CTL(_offset, _go_bit, _ac_bit, _atl_bit) \
+ { \
+ .offset = (_offset), \
+ .go_bit = (_go_bit), \
+ .ac_bit = (_ac_bit), \
+ .atl_bit = (_atl_bit), \
+ }
+
+struct ccu_policy {
+ struct bcm_lvm_en enable;
+ struct bcm_policy_ctl control;
+};
+
+/*
* Each CCU defines a mapped area of memory containing registers
* used to manage clocks implemented by the CCU. Access to memory
* within the CCU's space is serialized by a spinlock. Before any
@@ -390,6 +460,7 @@ struct ccu_data {
void __iomem *base; /* base of mapped address space */
spinlock_t lock; /* serialization lock */
bool write_enabled; /* write access is currently enabled */
+ struct ccu_policy policy;
struct list_head links; /* for ccu_list */
struct device_node *node;
struct clk_onecell_data clk_data;
--
1.7.9.5
^ permalink raw reply related [flat|nested] 8+ messages in thread* [PATCH v4 7/7] clk: bcm281xx: add clock hysteresis support
2014-04-08 21:43 [PATCH v4 0/7] clk: bcm281xx: updates Alex Elder
` (5 preceding siblings ...)
2014-04-08 21:43 ` [PATCH v4 6/7] clk: bcm281xx: add clock policy support Alex Elder
@ 2014-04-08 21:43 ` Alex Elder
6 siblings, 0 replies; 8+ messages in thread
From: Alex Elder @ 2014-04-08 21:43 UTC (permalink / raw)
To: linux-arm-kernel
Add support for clock gate hysteresis control. For now, if it's
defined for a clock, it's enabled.
Signed-off-by: Alex Elder <elder@linaro.org>
---
drivers/clk/bcm/clk-kona-setup.c | 30 ++++++++++++++++++++++++++++++
drivers/clk/bcm/clk-kona.c | 33 +++++++++++++++++++++++++++++++++
drivers/clk/bcm/clk-kona.h | 19 +++++++++++++++++++
3 files changed, 82 insertions(+)
diff --git a/drivers/clk/bcm/clk-kona-setup.c b/drivers/clk/bcm/clk-kona-setup.c
index 773ad7c..e5aeded 100644
--- a/drivers/clk/bcm/clk-kona-setup.c
+++ b/drivers/clk/bcm/clk-kona-setup.c
@@ -81,6 +81,7 @@ static bool peri_clk_data_offsets_valid(struct kona_clk *bcm_clk)
struct peri_clk_data *peri;
struct bcm_clk_policy *policy;
struct bcm_clk_gate *gate;
+ struct bcm_clk_hyst *hyst;
struct bcm_clk_div *div;
struct bcm_clk_sel *sel;
struct bcm_clk_trig *trig;
@@ -106,12 +107,25 @@ static bool peri_clk_data_offsets_valid(struct kona_clk *bcm_clk)
}
gate = &peri->gate;
+ hyst = &peri->hyst;
if (gate_exists(gate)) {
if (gate->offset > limit) {
pr_err("%s: bad gate offset for %s (%u > %u)\n",
__func__, name, gate->offset, limit);
return false;
}
+
+ if (hyst_exists(hyst)) {
+ if (hyst->offset > limit) {
+ pr_err("%s: bad hysteresis offset for %s "
+ "(%u > %u)\n", __func__,
+ name, hyst->offset, limit);
+ return false;
+ }
+ }
+ } else if (hyst_exists(hyst)) {
+ pr_err("%s: hysteresis but no gate for %s\n", __func__, name);
+ return false;
}
div = &peri->div;
@@ -261,6 +275,17 @@ static bool gate_valid(struct bcm_clk_gate *gate, const char *field_name,
return true;
}
+static bool hyst_valid(struct bcm_clk_hyst *hyst, const char *clock_name)
+{
+ if (!bit_posn_valid(hyst->en_bit, "hysteresis enable", clock_name))
+ return false;
+
+ if (!bit_posn_valid(hyst->val_bit, "hysteresis value", clock_name))
+ return false;
+
+ return true;
+}
+
/*
* A selector bitfield must be valid. Its parent_sel array must
* also be reasonable for the field.
@@ -379,6 +404,7 @@ peri_clk_data_valid(struct kona_clk *bcm_clk)
struct peri_clk_data *peri;
struct bcm_clk_policy *policy;
struct bcm_clk_gate *gate;
+ struct bcm_clk_hyst *hyst;
struct bcm_clk_sel *sel;
struct bcm_clk_div *div;
struct bcm_clk_div *pre_div;
@@ -406,6 +432,10 @@ peri_clk_data_valid(struct kona_clk *bcm_clk)
if (gate_exists(gate) && !gate_valid(gate, "gate", name))
return false;
+ hyst = &peri->hyst;
+ if (hyst_exists(hyst) && !hyst_valid(hyst, name))
+ return false;
+
sel = &peri->sel;
if (selector_exists(sel)) {
if (!sel_valid(sel, "selector", name))
diff --git a/drivers/clk/bcm/clk-kona.c b/drivers/clk/bcm/clk-kona.c
index 7d90c34..d603c4e 100644
--- a/drivers/clk/bcm/clk-kona.c
+++ b/drivers/clk/bcm/clk-kona.c
@@ -527,6 +527,35 @@ static int clk_gate(struct ccu_data *ccu, const char *name,
return -EIO;
}
+/* Hysteresis operations */
+
+/*
+ * If a clock gate requires a turn-off delay it will have
+ * "hysteresis" register bits defined. The first, if set, enables
+ * the delay; and if enabled, the second bit determines whether the
+ * delay is "low" or "high" (1 means high). For now, if it's
+ * defined for a clock, we set it.
+ */
+static bool hyst_init(struct ccu_data *ccu, struct bcm_clk_hyst *hyst)
+{
+ u32 offset;
+ u32 reg_val;
+ u32 mask;
+
+ if (!hyst_exists(hyst))
+ return true;
+
+ offset = hyst->offset;
+ mask = (u32)1 << hyst->en_bit;
+ mask |= (u32)1 << hyst->val_bit;
+
+ reg_val = __ccu_read(ccu, offset);
+ reg_val |= mask;
+ __ccu_write(ccu, offset, reg_val);
+
+ return true;
+}
+
/* Trigger operations */
/*
@@ -1131,6 +1160,10 @@ static bool __peri_clk_init(struct kona_clk *bcm_clk)
pr_err("%s: error initializing gate for %s\n", __func__, name);
return false;
}
+ if (!hyst_init(ccu, &peri->hyst)) {
+ pr_err("%s: error initializing hyst for %s\n", __func__, name);
+ return false;
+ }
if (!div_init(ccu, &peri->gate, &peri->div, &peri->trig)) {
pr_err("%s: error initializing divider for %s\n", __func__,
name);
diff --git a/drivers/clk/bcm/clk-kona.h b/drivers/clk/bcm/clk-kona.h
index 4bcba13..2537b30 100644
--- a/drivers/clk/bcm/clk-kona.h
+++ b/drivers/clk/bcm/clk-kona.h
@@ -60,6 +60,8 @@
#define gate_flip_enabled(gate) FLAG_FLIP(gate, GATE, ENABLED)
+#define hyst_exists(hyst) ((hyst)->offset != 0)
+
#define divider_exists(div) FLAG_TEST(div, DIV, EXISTS)
#define divider_is_fixed(div) FLAG_TEST(div, DIV, FIXED)
#define divider_has_fraction(div) (!divider_is_fixed(div) && \
@@ -205,6 +207,22 @@ struct bcm_clk_gate {
.flags = FLAG(GATE, HW)|FLAG(GATE, EXISTS), \
}
+/* Gate hysteresis for clocks */
+struct bcm_clk_hyst {
+ u32 offset; /* hyst register offset (normally CLKGATE) */
+ u32 en_bit; /* bit used to enable hysteresis */
+ u32 val_bit; /* if enabled: 0 = low delay; 1 = high delay */
+};
+
+/* Hysteresis initialization macro */
+
+#define HYST(_offset, _en_bit, _val_bit) \
+ { \
+ .offset = (_offset), \
+ .en_bit = (_en_bit), \
+ .val_bit = (_val_bit), \
+ }
+
/*
* Each clock can have zero, one, or two dividers which change the
* output rate of the clock. Each divider can be either fixed or
@@ -372,6 +390,7 @@ struct bcm_clk_trig {
struct peri_clk_data {
struct bcm_clk_policy policy;
struct bcm_clk_gate gate;
+ struct bcm_clk_hyst hyst;
struct bcm_clk_trig pre_trig;
struct bcm_clk_div pre_div;
struct bcm_clk_trig trig;
--
1.7.9.5
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